Non-impact cardio (for people with knee pain!) or Yoga for HMS (if you're WTF?! Google this it's syndrome!) or arm balances or skin nutrition -internal(eg diet or pills) as well as external things to consider, or exercise for bone health (esp for osteoperosis which is v.common now ppl don't get as much calcium though food as they may have before dairy alternatives and green juice became a thing)- exercise has to work around non impact but still be intense enough to build muscle which is fine...as long as you love weight training, and IMO many just don't or are like me and are afraid of it because despite the science, some of us really do bulk up amazingly quickly (without suppliments!) so muscle building the smaller non obvious ones (eg lats, biceps, quads, calves) could be useful. Or exercises on the reformer which focus on a different muscle group each 15 mins and do a total body workout over 2 hours (I could go on for hours here but I'm pretty sure you're done reading my stuff by now if you havn't stopped reading already!)